Eukaryotic organism
| Eukaryotes Temporal range: Rhyacian - Present 2100–0Ma |
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| Eukaryotes and some examples of their diversity – clockwise from top left: Red mason bee, Boletus edulis, Common chimpanzee, Isotricha intestinalis, Persian buttercup, and Volvox carteri | |
| Scientific classification | |
| Domain: |
Eukaryota (Chatton, 1925) Whittaker & Margulis, 1978 |
| Supergroups and kingdoms | |
Eukaryotic organisms that cannot be classified under the kingdoms Plantae, Animalia or Fungi are sometimes grouped in the kingdom Protista. |
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Eukaryotic organisms that cannot be classified under the kingdoms Plantae, Animalia or Fungi are sometimes grouped in the kingdom Protista.
A eukaryote (/juːˈkæri.oʊt/ or /juːˈkæriət/) is any organism whose cells have a cell nucleus and other organelles enclosed within membranes. Eukaryotes belong to the domain Eukaryota or Eukarya, and can be unicellular or multicellular organisms. The defining feature that sets eukaryotic cells apart from prokaryotic cells (Bacteria and Archaea) is that they have membrane-bound organelles, especially the nucleus, which contains the genetic material enclosed by the nuclear membrane. The presence of a nucleus gives eukaryotes their name, which comes from the Greek (eu, "well" or "true") and (karyon, "nut" or "kernel"). Eukaryotic cells also contain other membrane-bound organelles such as and the Golgi apparatus. In addition, plants and algae contain chloroplasts. Unlike unicellular archaea and bacteria, eukaryotes may also be multicellular and include organisms consisting of many kinds of tissue and cell types.
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